basic card layout implementation; merged sidebar with menu
actions menu for card layout items
loading post comments (without UI)
post comments UI (card layout)
global AppController, better csrf token propagation
enhanced file structure for angular content, concat/minification for production mode
main app script minification
moved card layouting to a separate directive; card controller enhancements
finished card layout implementation; removed obsolete css/js
upgraded project and dev dependencies
migrated login/register to angular; deprecated invitation codes and recaptcha; code cleanup; minor fixes
corrected 'registration' url in login view
SSL support; closes #94